Our builder never sealed our exterior honed limestone, and having gone through a winter and hurricane few months ago, the stone show a lot of water stains, and some black mold here and there. I tried few products, including StoneTech KlenzAll and few bleach based products from Home Depot, and none seemed to provide good results.
How do you guys suggest tackling this issue? I am thinking of using Simple Sherry with some bleach and buff the dark spots that the solution doesn’t remove. What’s your take?